The main contents include: Sun Yat-sen's early revolutionary activities, the Revolution of 1911, the cooperation and peaceful reunification between the Kuomintang and the Communist Party, political thoughts, the formation and development of the Three People's Principles, philosophical thoughts, economic construction thoughts, scientific and technological thoughts, and educational thoughts. The first three lectures briefly introduced Sun Yat-sen's major revolutionary practice activities and showed his great contribution to the democratic revolution and modernization process in China. The last seven lectures comprehensively introduce his theoretical background, ideological origin, development track and historical influence. Reading An Introduction to Sun Yat-sen's Thought will make readers feel the enlightenment and practical significance of Sun Yat-sen's spirit in the new historical period, thus stimulating patriotic feelings and establishing the belief of fighting for the great rejuvenation of the Chinese nation.